How can I delete all the Time Machine backups to make room for more? And how do I force the trash to empty?

I moved a bunch of my husband's files from his Macbook (which is dieing) to my iMac.  I created a user for him on my iMac so he'd be able to keep his stuff separate from mine.  All is working great except my Time Machine is now unable to backup.  The total of used space on my hard drive (including the recently added user's files) is about 420 GB.  The amount of capacity of my external hard drive is 999GB.  I think Time Machine failed because there was all of a sudden so much more data and a new full backup would be more than the unused capacity of the HD?  Regardless I don't need any old backups.  I have all my files and all his files.  So I moved all the backups from the external HD to the trash.  Apparently that's a no no.  I can't fully empty the trash now and that is making my iMac crazy slow. 
1) Can anyone tell me how to force the trash to empty?
2) Is there a way to delete the whole external HD and start over with a new full backup via Time Machine?  In Disk Utility I try to erase the partition and get an error "Volume Erase failed with the error: Couldn't unmount disk." Then I try to Unmount it and get another "Unmount failed. The disk Backup iOmega could not be unmounted.  Make sure that all applications and files are closed on this disk." I turned off Time Machine and tried again but with the same errors.
The external HD is called iOmega.  It only connects to the iMac with USB.  Any help is much appreciated!!!!

Try this instead:
Drive Partition and Format
1. Open Disk Utility in your Utilities folder.
2. Select the backup volume from the left side list. Click on the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.)
4. Click on the Erase button.
You will need to reconfigure Time Machine preferences for the backup.
FYI: Never remove Time Machine backup data except through the Time Machine application. If you aren't sure about using Time Machine then visit Pondini's Time Machine FAQ for help with all things related to Time Machine.

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